Add some Chrome addons
Link to settings page from quickstart (fixes #376)
Add label "(6)" to cheatsheet.

Fixes #348.
Merge branch 'master' of https://github.com/regines/qutebrowser into regines-master
Regenerate authors
Merge branch 'regines-master'
Merge branch 'link-to-settings-page' of https://github.com/helenst/qutebrowser into helenst-link-to-settings-page
Regenerate docs
Merge branch 'helenst-link-to-settings-page'
Merge branch 'master' of https://github.com/The-Compiler/qutebrowser

Upstream.